Is CVE-2026-10099 actively exploited?

No active exploitation of CVE-2026-10099 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-10099 be exploited remotely?

No. CVE-2026-10099 requires local access to exploit.

What is the CVSS score of CVE-2026-10099?

CVE-2026-10099 has a CVSS score of 4.0 (MEDIUM).

HOME VULNERABILITIESCVE-2026-10099

MEDIUM

CVE-2026-10099

CWE-1286Published: May 29, 2026· Updated: Jun 1, 2026

4.0

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.8th

Official Description

XX-Net V5.16.6 contains a WebSocket frame parsing vulnerability in the WebSocket_receive_worker routine of simple_http_server.py that allows attackers to cause corrupted application data by sending unmasked WebSocket frames. The server unconditionally reads 4 bytes as a masking key regardless of whether the MASK bit is set in the frame header, causing the first 4 bytes of payload to be consumed as a mask key and the remaining payload to be incorrectly XOR-decoded, resulting in data corruption alongside missing RSV bit, opcode, and FIN fragmentation validations.

NVD Source

Technical Analysis

CVE-2026-10099 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.